/ Thesaurus / I Synonyms of irreligionist Find synonyms for: Noun1. irreligionist, disbeliever, nonbeliever, unbelieverusage: someone who is indifferent or hostile to religionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language